Hey, just thought I'd actually be helpful here because, I know the feeling of messing up this bad... But I have got a visa in the end.I made 4 mistakes and 3 of which were critical but I crossed them out on a hard copy of the application form, wrote the correct answers in pen and wrote a cover letter explaining the mistakes with the application and it worked!Hope this encourages anyone fearing they may have messed up, I was actually surprised. I would certainly try to avoid this in future but I'm glad it worked this time.